A System of Natural Philosophy, in which are Explained the Principles of Mechanics, Hydrostatics [etc.]: To which are Added Questions for the Examination of Pupils ...Pratt, Woodford, Farmer, and Brace, 1854 |
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angle appear atmosphere attraction axis axle ball barometer battery called center of gravity centrifugal force circle colors concave consequently convergent convex lens convex mirror copper cylinder degrees direction distance Earth eclipse effect elastic electricity engine equal equator Explain Fig feet fluid focus force fulcrum glass heat hence hydrometer inclined plane instrument iron length lens lever machine magnet means mercury metal miles Moon motion move object orbit orifice parallax parallel particles pass pendulum perpendicular piece pipe piston planets plate poles pounds pressure principle produced proportion pulley pump quantity of matter raised rays of light reflected reflecting telescope refracted represented by Fig respect retina revolution revolve rope round screw seen side specific gravity stars steam substances Suppose surface suspended telescope thrown tion tube turned upward valve velocity vessel vibrations visual angle weight wheel wire zinc
Popular passages
Page 159 - ... placid appearance, closing a beautiful afternoon, and the usual mirth of the evening watch was proceeding, when the captain's order came to prepare with all haste for a storm. The barometer had begun to fall with appalling rapidity. As yet, the oldest sailors had not perceived even a threatening in the sky, and were surprised at the extent and hurry of the preparations: but the required measures were not completed, when a more awful hurricane burst upon them than the most experienced had ever...
Page 283 - The circumference of every circle is supposed to be divided into 360 equal parts called degrees, and each degree into 60 equal parts called minutes, and each minute into 60 equal parts called seconds, and these into thirds, fourths, &c.
Page 308 - It has already been explained, that the ecliptic is the plane of the Earth's orbit, and is supposed to be placed on a level with the Earth's horizon, and hence, that this plane is considered the standard...
Page 113 - ... in the latitude of London forms the standard of the British measure of extension. Its length oscillating in vacuo at the temperature of 62° of Fahrenheit, and reduced to the level of the sea, was determined by Captain Kater, in parts of the imperial standard yard, to be 39.1387 inches.
Page 203 - And they placed them on the heavenly tablets, each had thirteen weeks; from one to another (passed) their memorial, from the first to the second, and from the second to the third, and from the third to the fourth.
Page 177 - I considered how to produce rotative motions from them in the hest manner; and amongst various schemes which were subjected to trial, or which passed through my mind, none appeared so likely to answer the purpose as the application of the crank in the manner of the common turning lathe...
Page 159 - ... completed, when a more awful hurricane burst upon them than the most experienced had ever braved. Nothing could withstand it; the sails already furled and closely bound to the yards, were riven away in tatters; even the bare yards and masts were in great part disabled; and at one time the whole rigging had nearly fallen by the board.
Page 336 - Astronomy, there is the most complete table of comets yet published. This table contains the elements of 97 comets, calculated by different astronomers, down to the year 1808. From this table it appears that 24 comets have passed between the sun and the orbit of Mercury ; 33 between the orbits of Venus and the Earth; 15 between the orbits of the Earth and Mars ; 3 between the orbits of Mars and Ceres i nnd 1 between the orbits of Ceres and Jupiter.
Page 47 - ... surface of the base and the mass of the body were collected, and made to revolve about the centre of the base of the given body, the angular velocity destroyed by its friction would be equal to the angular velocity destroyed in the given body by its friction in the same time.
Page 170 - In Russia and a few other countries another instrument is used, called the Reaumur ; the freezing point is marked 0°, or zero, and the boiling point 80°, the space between these two points being divided into 80 equal parts; 183° R.